Absolutely, the weight of clinical evidence over the last century is indisputable. Most recently in a study conducted by David Spiegel of Stanford University, using a brain scan it was demonstrated that through hypnosis subjects could be induced to see colours where there were none, in a black and white object. The scan showed an increase in blood supply to areas of the brain used to register colour. This may seem like a trivial exercise however it’s a simple scientific proof that this powerful phenomenon is objectively measurably and real.